package com.example.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

//@Component
public class AccessFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        String token = exchange.getRequest().getQueryParams().getFirst("token");

        if (null == token) {
            ServerHttpResponse response = exchange.getResponse();
            response.getHeaders().add("Content-Type","application/json; charset=utf-8");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);

            String message = "{\"message\":\"" + HttpStatus.UNAUTHORIZED.getReasonPhrase() + "\"}";
            DataBuffer buffer = response.bufferFactory().wrap(message.getBytes());
            return response.writeWith(Mono.just(buffer));

        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
